Lie
They say the key to telling a lie is to totally believe the lie yourself. They say that if you believe your own lie, others will believe it as well. This is key.
さ
いつわ
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The lie you told was about not stealing your buddy’s saw (さ). You actually did steal his saw. He saw you steal his saw, but now you are trying to lie your way out of it. It’s not going well.